Process of sealing contact terminals to electron tubes



5. J. KOCH 2,511,164

PROCESS OF SEALING CONTACT TERMINALS TO ELECTRON TUBES June 13, 1950Original Filed May 2, 1945 UNITED STATES PATENT OFFICE PROCESS OFSEALING CONTACT TER- MINALS TO ELECTRON TUBES Stanley J. Koch, Clifton,N. J assignor to Allen B. Du Mont Laboratories, Inc., Passaic, N. J., acorporation of Delaware Original application May 2, 1945, Serial No.

591,465. Divided and this application May 13, 1948, Serial No. 26,776

2 Claims- (CI. 49-81) This is a division of my application, Serial No.591,465, filed May 2, 1945, which issued September '7, 1948, as PatentNo. 2,448,808.

This invention relates to a process of securing 2 to maintain both amechanical and electrical connection between the contact I and rod 6.

A glass bead 1 is placed on the rod 6 with one end thereof in contactwith the portion 3 of the a terminal or contact in the wall of acathode- 5 terminal. ray tube or electron tube for making connection Ahole or opening slightly larger than the bead from a source ofelectrical potential to an elec- I is provided in a wall 8 of the tubewhere the trode extending inside of said tube. contact is to beinstalled. The bead I and rod Heretofore, connections of this type havebeen 6 are placed in this hole with the disc portion made by fusing aportion of the glass wall of the 10 3 of the contact I in contact withthe outer surtube and locating the terminal so that a lead face of theglass wall. The glass is then fused could be connected thereto. Withsuch connecby applying heat to it and the corresponding tions the glasstube was in danger of being broken portion of t head 7 to fuse e Sam oether as or cracked by the contact being struck or too shown in Fig. 3and also to fuse the bead I more much pressure being applied thereto.Besides, rely on he r d 6, nd als fu e the lass since the contactsurface between the contact o that it flo S y around the Portion 4member and the wall of the tube was not much of e Contact as indicated athus o e more than was provided by the thickness of the r ly anchoringthe contact in the glass wall wall of the tube, the danger of leakingand and o decreasing the an er of a leakage path breaking the vacuum inthe tube was increased. ming.

By the present invention prior difficulties have W at iS claimed is:been overcome and an electrical contact element The process of sealing acontact terminal to is Securely and firmly mounted on t t in the wall ofan electron tube, which comprises Such way t t t danger of t t b b iforming a metal contact with a head and neck, broken by force applied tothe contact or a blow said k t rm atin n an utwa dly xte striking andbreaking it is minimized, and at portion having an wardly cur fi a thesame time the danger of leakage of air ing an end of a meta r n Saidneck, placing a through the part where the contact is installed glassube o i r pl cin sai w rdly in the wall of the tube is materiallydecreased extending portion of said neck on the outside wall or entirelyovercome, of said electron tube, fusing the wall of said The inventionmay be understood in connecelectron tube where said contact terminal is10- tion with the accompanying drawing; in which: Gated, fusing t e W ofsa ass tube to Said Fig 1 is m i of th t t; curved flange and fusing oneend of said glass Fig. 2 is a side view partly in section showing e tothe Wall of said electron tube. the contact and a pin therefor, whichpin has a h process of sealing a contact terminal to short cylinder ofglass thereon; and a wall of a glass tube, which consists in securingFig 3 is t1 1 View showing portion a metal rod to said terminal, placinga glass bead of the wall of a tube with the contact in place. on Said pvi in a hole in the wall of said In the drawing, reference character Iindicates tube, rting said rod and said glass bead into the roundedportion or head of a contact to which i hole, fusing Said glass h ad tosaid wall and connection is to be made f o a source of sa1d rod, andfusing said wall to a portion of said tential. This connection may bemade, for extermmal' ample, by a snap terminal which is held on STANLEYhead I in the known way. REFERENCES CITED "Head I extends into a neckportion 2 which is flared outwardly into a disc portion 3 which isturned upwardly as indicated at 4 and ends in a downwardly extendingring portion, the end of The following references are of record in thefile of this patent:

UNITED STATES PATENTS which is shown by the reference character 5.Number Name Date A metal rod 6 is installed in the neck portion2,089,044 Thomas Aug. 3, 1937 2 01' the contact I and fits tightlytherein so as 2,151,809 har l w 1 9

